In the last week, we're having a high number of Macs catching the spinning ball of death after login. Most of the time they'll see the menu bar before freezing up, sometimes they'll see the dock. I've turned off all login/logout hooks and startup items, but perhaps they haven't gotten the update?
The behavior is really strange in that it seems to only exhibit the freezing behavior after a graceful shutdown. After freezing and force shutting down, the next login works.
What makes me think JSS, but doesn't make sense, is in the console, there are errors related to JSS:
Checking availability of https://jss.xxx.xxx:####
Error signing communication - Couldn't resolve host name
Waiting 5 seconds to try again...